The MCQ4438 from Micro Commercial Components is a MOSFET with Continous Drain Current 8.2 A, Drain Source Resistance 22 to 36 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for MCQ4438 can be seen below.